Pump and liquids.



G. I. LEONARD.

PUMP FOR LIQUIDS. lgggflgo APPLICATION FILED MAY 22, 1-916. PatentedJuly 10, 1917 2 SHEETS-SHEET I.

G I. LEONARD.

v PUMP FOR LIQUIDS.

APPLICATION FILED MAY 22, 1916.

Patented. July 10, 1917.

2 SHEETS-SHEET 2.

i l s GEORGE I. LEONARD, OF GHIGQ'B GO, ILLINOIS, ASSIGNGR T0 LEONARDPUMP AND MOTOR (30., OF CHICAGQ ILLINOIS, A CORPORATION OF MAINE.

PUMP FOR LIQUIDS.

eas es;

To all whom it may concern Be it known that T, GEORGE I. LEONARD,

a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented a new and useful Improvementin Pumps for Liquids, of which the following is a specification.

This invention relates more particularly to gear pumps for pumpingliquids; and my objects, generally stated, are to provide improvementsin gear pumps, preferably, though not necessarily, .of the herring-bonetype whereby the gears of the pumps inay be made closely,fitting toeffect a'high degree of efficiency of the pump, with a minimumexpenditure of power.

Referring to the accompanying drawings,Figure l is a View in verticalsectional elevation of a pump constructed in accordance with myinvention, the section being taken at the lines 1 on Figs. 2 and d andviewed'in the direction of the respective arrows. Fig. 2isaview insectional elevation of the lower portion of the struc-v ture shown inFig. 1, this view being taken at the line 2 on Fig. 1 and viewed in the.direction of the arrow. Fig. 3 is a. face view of the innersurface ofthe plate which forms the removal end wall of the gearcase. Fig. 4 is asectiontaken. at the line 4 on Fig. 2 and viewed in the directlon of thearrow, this view showing the gear-case 1n plan; and Fig. 5, a sectiontaken at the line 4 on Fig. 2 and. viewed-in the direction of the arrow,showing the gear-case in section.

The illustrated embodiment of my invention "involves a casing 6 for. thepumped liquid, and having an outlet 7, and a gearcase 8 in the casing 6in which gears 9, 10, 11 and 12 are rotatably mounted, the gearcase inthe arrangement shown being provided on the plate section 13 of the sidewall of the casing 6 and projecting in.--

wardly therefrom, the inner end wall lit of the case 8 being a separateplate bolted-to the side wall of the case.- The gears .9-and 10 aresecured in alinement on a shaft 15' journaled at its opposite endsv inthe end walls of the case 8 and adapted to be driven as through themedium of a sprocket 16.

The gears 11 and 12 are similarly positioned on a shaft 17 which extendsparallel with the shaft15 and is similarly journaled, The gears 9, 10,Hand 12, in the particular con-- Specification of Letters Patent. patgntedl July 1108), 1pm,

Application filed may 22, 1916. Serial No. 99,080.

structionillustrated, are of the herringbone type, the teeth of thegears on the shaft 15 converging toward the shaft 17 and the teeth onthe other, gears converging toward the shaft 15, respectively, andhaving accurate fit with each other. The inlet for the pump isrepresented at 18 and is in the form of a slot in, and extendinglongitudi-. nally of, the bottom of the gear-case 8, this slot openinginto the space in the gear-case 8 in which the said gears are located,ad-

jacent the point at which the several gears intermesh. 4

The main outlets ,in the gear-case 8, for the liquid which is pumped ashereinafter described, are provided in the top of the case 8, and arepreferably of the form as shown at 19. In addition to these outletsother, supplementary, outlets 20 are provided which are located in theend walls of;

the gear-case 8, these outlets opening through the innerfaces of thesewalls,* pref--.

erably at a point slightly abovethe axesfof the gears and substantiallymidway-therebetween; or, otherwords, at points which are -.coincident;with' those points which; the teeth of the-gears finallycontact, the

outlets 20 opening at their opp'osit'ei' ends- In the operation of'thepump described,

thegears 9, 10', 11 and 1 2rotatein the direc-.

tion of the arrows in Fig. 2 and as the pockets, formed in the gearsbetween their teeth,

' move out of intermeshing'relation with the opposing gear-teeth, thesaid intermeshing of the teeth having forced out of thesepockets thecontentsthereof, the liquid in-the inlet v1.8 is sucked into thesepockets and thence carried therein up and around the gearsas the latterrevolve, where it is acted upon by the gear-teeth which intermesh withthese pockets. The intermeshing action just referred to is a progressiveone, and as the gears continue to rotate-the liquid is forced from theinner ends of the pockets toward lltltl) ings l9. It will be manifestthat if this remnant of liquid is permitted to remain in the pockets itwill result either in effecting such resistance as to seriously affectthe proper operation of the pump, or cause it to become locked.According to the present invention provision is made for relieving thisremnant of liquid"and' this is accomplished through mum effectiveness.

Inasmuch as liquids are non-compressible,

it is necessary that the openings 19 (or the opening if one only isemployed) be of such size that the pockets in the gears will be open tothe interior of the. casing 6 from the moment that the cooperating teethof the gears intermesh therewith. It is preferred, however, that theseoutlets be of such shape and size that only those pockets wherein thepressure-producing operation is being performed, be subjected to thepressure of the-liquid previously pumped, in order that the amount ofsurface of the gears that is subj ected to the pressure of the liquidincasing '6 will be reduced to the minimum and therefore pressure on thebearings minimized. By making the open-s ings 19 as shown, the desiredcommunication between pockets of the gears and the interior of thecasing 6 is effected and the pressure on'thebearings is minimized.

end of the case coincident with the last points of contact of the teethof the gears, whereby the remnant of liquid between the intermeshingteeth at their last points of contact is forced from the case, theopening through the side wall of said case an forming said dischargebeing so shaped as to register substantially with only those parts ofthe teeth of the gears which are in mesh.

2. A liquid pump comprising, in combination, a gear-case, and closelyfitting intermeshing gears rotatably mounted in said case, the teeth onsaid gears being obliquely disposed and arranged to force liquidsupplied thereto in opposite directions toward the end of said case,said case opening through its side walls at opposite sides of thecenters of the gears for inlet and discharge of the liquid being pumped,and at the discharge side of said gears through the inner surfaces ofthe ends of said case coincident with the last points of contact of theteeth of the gears, whereby the remnant of liquid between theintermeshing teeth at their last points of contact at opposite ends ofthe gears, is forced from said case, the opening through the side wallof said case and forming said discharge being so shaped as to registersubstantially with only those parts of the teeth of the gears which arein mesh.

GEORGE I. LEONARD.

